He goes on to connect several router ... UPS unit [Gadget Addict] was using has a lead acid battery that was prone to failure on an almost annual basis — which defeats the purpose of a backup ...

Wait a few minutes for them to completely power back on. This restart should fix most issues with your modem and router and your internet should be back up ... is only as good as the internet ...

The Home Internet Backup plan includes free equipment starting at $20 monthly or $10 for T-Mobile voice customers. You will need power to the T-Mobile router ... As for a UPS, or uninterruptible ...

[TechRally] takes advantage of this to create an automatic DC UPS with dual outputs to power a router and modem in the event of a power outage. You can see two videos about the project below.